rcu: Wire up rcu_end_inkernel_boot()

This commit adds the invocation of rcu_end_inkernel_boot() just before
init is invoked.  This allows the CONFIG_RCU_EXPEDITE_BOOT Kconfig
option to do something useful and prepares for the upcoming
rcupdate.rcu_normal_after_boot kernel parameter.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
diff --git a/init/main.c b/init/main.c
index 9e64d70..c6ebefa 100644
--- a/init/main.c
+++ b/init/main.c
@@ -943,6 +943,8 @@
 
 	flush_delayed_fput();
 
+	rcu_end_inkernel_boot();
+
 	if (ramdisk_execute_command) {
 		ret = run_init_process(ramdisk_execute_command);
 		if (!ret)